/**
 * Copyright (c) 2010, Bjorn Roche
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the XO Audio, LLC nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
**/
package com.xonami.piecemeal;

import java.io.IOException;

import org.osgi.framework.Bundle;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleException;
import org.osgi.framework.ServiceListener;
import org.osgi.framework.ServiceEvent;

import java.lang.reflect.Method;

/*
 * This class implements a simple OSGi service that runs the static main
 * function on the given class when started. ATM, It is assumed that the service is
 * never stopped, though we've added a serviceListener so concievably we could
 * monitor and handle changes.
**/
public class Piecemeal implements BundleActivator, ServiceListener
{
    public static class InitializationException extends IOException {
       public InitializationException( String reason ) {
          super( reason );
       }
    }
    /**
     * Implements BundleActivator.start(). Prints
     * a message and adds itself to the bundle context as a service
     * listener.
     * @param context the framework context for the bundle.
    **/
    public void start(final BundleContext context)
    {
        context.addServiceListener(this);
        try {
           try {
              // search for and start the wrap and assembly services
              // (Since this service is declared t depend on those services, you'd
              //  think OSGi would start them for you, but this doesn't seem to be
              //  the case.)
              Bundle bs[] = context.getBundles();
              boolean assemblyLoaded = false, wrapLoaded = false;
              for( Bundle b : bs ) {
                 if( b.getSymbolicName() != null && b.getSymbolicName().equals( "org.ops4j.pax.url.assembly" ) ) {
                    b.start();
                    assemblyLoaded = true;
                 } else if( b.getSymbolicName() != null && b.getSymbolicName().equals( "org.ops4j.pax.url.wrap" ) ) {
                    b.start();
                    wrapLoaded = true;
                 }

                 //System.out.println( b.getBundleId() + ": " + b.getSymbolicName() + ", " + b.getLocation() + "[" + b.getState() + "]" );
              }
              if( !assemblyLoaded )
                 throw new InitializationException( "Could not find assembly protocol module." );
              if( !wrapLoaded )
                 throw new InitializationException( "Could not find wrap protocol module." );

              //System.out.println( context.getProperty("com.xonami.felixWrapper.bundle") );
              Bundle ib = context.installBundle( context.getProperty("com.xonami.piecemeal.bundle") );
              if( ib == null )
                 throw new InitializationException( "Could not find bundle specified in com.xonami.piecemeal.bundle." );
              //System.out.println(  ib.getBundleId() + ": " + ib.getSymbolicName() + ", " + ib.getLocation() + "[" + ib.getState() + "]" );
              ib.start(0);
           } catch( BundleException be ) {
              if( be.getNestedException() == null ) {
                 throw new InitializationException( be.getMessage() ) ;
              } else {
                 throw new InitializationException( be.getMessage() + ": " + be.getNestedException().getMessage() ) ;
              }
           }
        } catch( InitializationException ie ) {
           System.out.println( ie );
           new Thread() { //Put this in a seperate thread due to FELIX bug 1812
              public void run() {
                 System.exit(0);
              }
           }.start();
        }
    }

    /**
     * Implements BundleActivator.stop(). Prints
     * a message and removes itself from the bundle context as a
     * service listener.
     * @param context the framework context for the bundle.
    **/
    public void stop(BundleContext context)
    {
        context.removeServiceListener(this);
        // Note: It is not required that we remove the listener here,
        // since the framework will do it automatically anyway.
    }

    /**
     * Implements ServiceListener.serviceChanged().
     * @param event the fired service event.
    **/
    public void serviceChanged(ServiceEvent event)
    {
        String[] objectClass = (String[])
            event.getServiceReference().getProperty("objectClass");

        switch( event.getType() ) {
        case ServiceEvent.REGISTERED:
           break;
        case ServiceEvent.UNREGISTERING:
           break;
        case ServiceEvent.MODIFIED:
           break;
        }
    }
}
